package com.soft.util;

import java.sql.Connection;
import java.sql.DriverManager;

public class DBHelper {
    //数据库驱动
    private static final String driver = "com.mysql.jdbc.Driver";
    //连接数据库的URL地址
    private static final String url = "jdbc:mysql://localhost:3306/red_wine?useSSL=false&useUnicode=true&characterEncoding=UTF-8";
    //数据库的用户名
    private static final String username = "root";
    //数据库的密码
    private static final String password = "root";
    //私有类型连接对象
    private static Connection conn = null;

    //静态代码块负责加载驱动
    static {
        try {
            Class.forName(driver);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    //单例模式返回数据库连接对象
    public static Connection getConnection() throws Exception {
        if (conn == null) {
            conn = DriverManager.getConnection(url, username, password);
            return conn;
        }
        return conn;
    }

    /**
     * 此方法用于判断数据库是否连接成功
     */
    public static void main(String[] args) {
        try {
            Connection conn = DBHelper.getConnection();
            if (conn != null) {
                System.out.println("数据库连接正常");
            } else {
                System.out.println("数据库连接异常");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}
